Credit utilisation, the share of a client’s available credit they are actually using, is one of the fastest-moving inputs into their credit score and one of the few a client can change within weeks. It influences both approval odds and the loan terms on the table, so reading utilisation correctly explains many otherwise puzzling declines and score movements between enquiry and approval.
This guide covers how utilisation works, how lenders read it during assessment, what advice actually helps a client reduce it and where the common rules of thumb mislead.
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What utilisation measures
Utilisation compares card balances to card limits. A client with a $10,000 limit carrying a $2,000 balance sits at 20 per cent. Lower ratios generally read better because they suggest the client uses credit by choice rather than necessity. The figure moves monthly with reporting cycles, which means a client who pays balances down before their statement date can improve the reported position faster than one who pays after it.
How it shapes assessment
Utilisation feeds the score, and the score feeds every stage from enquiry through to preapproval. Between two applicants with similar scores, the file with lower utilisation usually reads as more manageable, and some lenders look directly at high card limits as a serviceability risk even when balances are low, because the client could draw on them after settlement.
The knock-on effects reach pricing too. Better utilisation supports stronger credit scores and sharper interest rates, while maxed-out cards alongside an otherwise strong income often explain a pricing load or a decline that surprises the client.
Advice that actually reduces utilisation
The direct levers are paying balances down, spreading remaining debt across accounts so no single card sits near its limit, and requesting limit increases, which lowers the ratio without extra payments. Each lever has a catch worth explaining: limit increases require an enquiry in most cases and can tempt further spending, closing unused cards can raise utilisation on the remaining accounts, and the common advice to keep every ratio below 30 per cent is a rule of thumb from other markets rather than an Australian standard, so treat it as a guide rather than a threshold lenders publish.
Where a client cannot restructure in time, look at lenders with different appetites. non-bank lenders sometimes accept higher utilisation than major banks, particularly where the rest of the file is strong, and experienced mortgage brokers know which panels currently tolerate it.
Protecting the position during the mortgage application process
Utilisation is live until settlement, so advise clients to freeze new credit applications, avoid large card purchases and resist buy-now-pay-later sign-ups between application and approval. A fresh enquiry or a jumped-up balance at re-check time can undo an otherwise approved file. Pull their report before lodging so the starting point is known rather than assumed.
Longer term, steady habits do the work: spending tracked against a plan, payments automated before due dates and periodic report checks for errors. Point clients towards reputable budgeting tools and free annual credit reports from each bureau. Before your next appointment with a client carrying card balances above half their limits, ask them to pay balances down before the next statement cycle; that single move can lift their score in time to matter.
